From 9eb1076b61e83647028a2f6b665b6f9afcb793b0 Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Wed, 23 Dec 2015 11:31:08 +0100
Subject: [PATCH] Add infrastructure to disable the build of certain extensions

Some of the extensions part of the Python core have dependencies on
external libraries (sqlite, tk, etc.) or are relatively big and not
necessarly always useful (CJK codecs for example). By extensions, we
mean part of Python modules that are written in C and therefore
compiled to binary code.

Therefore, we introduce a small infrastructure that allows to disable
some of those extensions. This can be done inside the configure.ac by
adding values to the DISABLED_EXTENSIONS variable (which is a
word-separated list of extensions).

The implementation works as follow :

 * configure.ac defines a DISABLED_EXTENSIONS variable, which is
   substituted (so that when Makefile.pre is generated from
   Makefile.pre.in, the value of the variable is substituted). For
   now, this DISABLED_EXTENSIONS variable is empty, later patches will
   use it.

 * Makefile.pre.in passes the DISABLED_EXTENSIONS value down to the
   variables passed in the environment when calling the setup.py
   script that actually builds and installs those extensions.

 * setup.py is modified so that the existing "disabled_module_list" is
   filled with those pre-disabled extensions listed in
   DISABLED_EXTENSIONS.

Patch ported to python2.7 by Maxime Ripard <ripard@archos.com>, and
then extended by Thomas Petazzoni
<thomas.petazzoni@free-electrons.com>.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 Makefile.pre.in | 6 +++++-
 configure.ac    | 2 ++
 setup.py        | 5 ++++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/Makefile.pre.in b/Makefile.pre.in
index f1bdd99..e0f9e0f 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -177,6 +177,8 @@ FILEMODE=	644
 # configure script arguments
 CONFIG_ARGS=	@CONFIG_ARGS@
 
+# disabled extensions
+DISABLED_EXTENSIONS=	@DISABLED_EXTENSIONS@
 
 # Subdirectories with code
 SRCDIRS= 	@SRCDIRS@
@@ -574,6 +576,7 @@ sharedmods: $(BUILDPYTHON) pybuilddir.txt
 	esac; \
 	$(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' \
 		_TCLTK_INCLUDES='$(TCLTK_INCLUDES)' _TCLTK_LIBS='$(TCLTK_LIBS)' \
+		DISABLED_EXTENSIONS="$(DISABLED_EXTENSIONS)" \
 		$(PYTHON_FOR_BUILD) $(srcdir)/setup.py $$quiet build
 
 # Build static library
@@ -1384,7 +1387,8 @@ libainstall:	all python-config
 # Install the dynamically loadable modules
 # This goes into $(exec_prefix)
 sharedinstall: sharedmods
-	$(RUNSHARED) $(PYTHON_FOR_BUILD) $(srcdir)/setup.py install \
+	$(RUNSHARED) DISABLED_EXTENSIONS="$(DISABLED_EXTENSIONS)" \
+		$(PYTHON_FOR_BUILD) $(srcdir)/setup.py install \
 	   	--prefix=$(prefix) \
 		--install-scripts=$(BINDIR) \
 		--install-platlib=$(DESTSHARED) \
diff --git a/configure.ac b/configure.ac
index 6342b81..a3026b8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2352,6 +2352,8 @@ LIBS="$withval $LIBS"
 
 PKG_PROG_PKG_CONFIG
 
+AC_SUBST(DISABLED_EXTENSIONS)
+
 # Check for use of the system expat library
 AC_MSG_CHECKING(for --with-system-expat)
 AC_ARG_WITH(system_expat,
diff --git a/setup.py b/setup.py
index d3bf8e5..2a504d2 100644
--- a/setup.py
+++ b/setup.py
@@ -39,7 +39,10 @@ host_platform = get_platform()
 COMPILED_WITH_PYDEBUG = ('--with-pydebug' in sysconfig.get_config_var("CONFIG_ARGS"))
 
 # This global variable is used to hold the list of modules to be disabled.
-disabled_module_list = []
+try:
+    disabled_module_list = sysconfig.get_config_var("DISABLED_EXTENSIONS").split(" ")
+except KeyError:
+    disabled_module_list = list()
 
 def add_dir_to_list(dirlist, dir):
     """Add the directory 'dir' to the list 'dirlist' (after any relative
-- 
2.6.4